Epizootia de Aschersonia cf. goldiana em Bemisia tabaci (Homoptera: Aleyrodidae) biótipo B no estado de São Paulo

Abstract

The first observations on the presence of Bemisia tabaci biotype B (=B. argentifolii) in Brazil were made in the beginning of the 1990s in the State of São Paulo. From then on, that whitefly has spread out to other States. In the summer of 1997/98, B. tabaci biotype B reached Guaíra-Miguelopólis, an area of the State of São Paulo not yet infested, with high populations of the insect, mainly in soybean, cotton and vegetable crops. In the the first week of February 1998, during a survey in an abandoned field of soybean, an epizootic of Aschersonia cf. goldiana was verified on that whitefly in the whole area, with total infection of nymphs in the lower surface of the leaves. At the same date, in two other soybean fields of the region, the incidence of this entomopathogen was low, but it increased in the following two weeks, reaching high control levels of the insect, which was similar to the previously observed field. This occurrence indicates A. cf. goldiana as a potential agent for biological control of B. tabaci biotype B.

New records of entomopathogenic fungi infecting Bemisia tabaci and Trialeurodes vaporariorum, pests of horticultural crops, in Argentina

“…In South America reports of entomopathogenic fungi affecting whiteflies are scarce (Drummond et al 1987;Sosa Gomez et al 1997;Gomez 1999;Lourençao et al 1999). In Argentina, L. lecanii was reported previously by López Lastra (1989) and Yasem de Romero (1992) from Coleoptera and Hemiptera, respectively.…”

Exigências Térmicas de Bemisia tabaci (Genn.) Biótipo B (Hemiptera: Aleyrodidae)

“…Em Guaíra verificaram-se altas infestações em abóbora, repolho, couve e alface, e em Miguelópolis houve intensa infestação em soja e algodão, com perdas de 100% (Lourenção et al 1999). A soja, uma das principais culturas exploradas no nosso país, tem sido alvo de severos ataques dessa praga (Costa et al 1993).…”

Resistance of Soybean Genotypes to Bemisia tabaci (Genn.) Biotype B (Hemiptera: Aleyrodidae)

“…The silverleaf white ly, Bemisia tabaci biotype B, has become a serious problem (Lourenção et al 1999, Tamai 2006. The honeydew excrete by white lies favors the development of a fungus of the genus Capnodium, which forms a dark layer of mycelia on the leaf surface, reducing the photosynthetic capacity and other plant physiological functions (Ferreira & Avidos 1998).…”